Some Issues Concerning Holographic Dark Energy

TL;DR

This paper investigates the stability, evolution, and coincidence problem of interacting holographic dark energy, concluding that interaction alone cannot fully solve the coincidence problem, but inflation might offer a better solution.

Contribution

It provides a stability analysis of holographic dark energy perturbations and explores the impact of interactions and inflation on the cosmic coincidence problem.

Findings

Holographic dark energy perturbations are stable.

Interaction does not fully resolve the coincidence problem.

Inflation may better address the coincidence problem.

Abstract

We study perturbation of holographic dark energy and find it be stable. We study the fate of the universe when interacting holographic dark energy is present, and discuss a simple phenomenological classification of the interacting holographic dark energy models. We also discuss the cosmic coincidence problem in the context of holographic dark energy. We find that the coincidence problem can not be completely solved by adding an interacting term. Inflation may provide a better solution of the coincidence problem.